(a)Derive an expression for VA − VB, the potential difference between points A and B (b) Does your result reduce to the expected answer when d = 0? When a = 0? and when q = 0.
VA=kQrA,VB=kQrBV_A=\frac{kQ}{r_A},V_B=\frac{kQ}{r_B}VA=rAkQ,VB=rBkQ
VA−VB=kQrB−rArArBV_A-V_B=kQ\frac{r_B-r_A}{r_Ar_B}VA−VB=kQrArBrB−rA
When
Put value then We can written as
VB−VA=0V_B-V_A=0VB−VA=0
VA=VBV_A=V_BVA=VB
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